Coupling of Geochemical and Multiphase Flow Processes for Validation of the MUFITS Reservoir Simulator Against TOUGH

A benchmark study is presented comparing the outcome of two different simulators, the established TOUGH and the modern, more efficient MUFITS, with the purpose to evaluate the coupling of geochemical processes to multiphase flow in the context of subsurface CO2 storage. The results of the two simulators are in excellent agreement. The implemented simplified one-way coupling is a computationally efficient alternative to fully coupled reactive transport simulations. Every coupled process simulation framework benefits from the inclusion of different tools, which is the only way to enable validation and control of numerical results.